如图,在直三棱柱
中,平面
平面
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/10/f0a91814-d6e9-4911-a7d2-df3b7443fb25.png?resizew=133)
(1)求证:
;
(2)若
,平面
与平面
的夹角的大小是
与平面
所成角的大小的2倍,求侧棱BB1的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21dee56b9f36ba8f76fe67b76383636b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab3e0dba5705e1d749cfb21ebbb2ed93.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/10/f0a91814-d6e9-4911-a7d2-df3b7443fb25.png?resizew=133)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/829018a6ca0aff95d89e3f7cd943274e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9afac7c616bbb14e1ed428a3c507c7dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b94e97d085cea077cb82a0b7d2f523e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e26d9636ad77369535852c6e4493446a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b94e97d085cea077cb82a0b7d2f523e.png)
更新时间:2023-05-05 12:14:03
|
相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】如图,在三棱锥
中,平面
平面
,
,
,
,D、E分别为SB,AB的中点.
(1)求证:
;
(2)求二面角
的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41e5db1d2fd912f77923e4c120a7dc19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/448cbac9a1ef3de7538a6b30cdc39582.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21665d21bbfb04410c78345de1fd15ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3493ae59c386883c6a7eab670ee251c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87d11dd7422f4703763abc23d83c7584.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4d6b27a35a18492e60b5b99789d3395.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/30/169bca4c-021f-4d8d-a95a-c0407adc003e.png?resizew=145)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8390b8e153b2338b6485552996aea6f2.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c76abad7103e74e5613a802475f1c0f9.png)
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解答题-问答题
|
适中
(0.65)
【推荐2】如图1,平面四边形ABCD中,
,
,
且BC=CD.将
CBD沿BD折成如图2所示的三棱锥
,使二面角
的大小为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/31/912184c8-a3f8-4277-9fea-99ef9baadaf2.png?resizew=296)
(1)证明:
;
(2)求直线BC'与平面C'AD所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71a46dc0bb5d8fa33583817e530a5d21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f5fc4ad65b723b6a8da4c8dac154e6e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bd6a2b112facda441f4e34bf5c145fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6595597d25112f247753397d25bf5080.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81b32ae75c9beabff560f1b52a52d434.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/283fc98ab986345e5552c24f668ff216.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/996bf3d35b6763cbc1a423b13a9df2dd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/31/912184c8-a3f8-4277-9fea-99ef9baadaf2.png?resizew=296)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/555dfe77eeb168a880694e22bd9acbdd.png)
(2)求直线BC'与平面C'AD所成角的正弦值.
您最近一年使用:0次
解答题-证明题
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适中
(0.65)
解题方法
【推荐1】如图,在直三棱柱
中,
分别为线段
的中点,
,
,
.
平面
;
(2)若四棱锥
的体积为12,求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/927456b0989846a2f1573844bbaa2105.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13bc333fa45f333c0820c9cb3d167952.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3570a95f68349fcd9417fcda62e78e7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294a490d0908d00e9bb7fb75138e0b5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1682d306c38087d9e6f7efb9cec596a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43ea211a573491409cb60f9fbe9a65cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34be4e71cabf458f17a6cd7f24bc70af.png)
(2)若四棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01441e64b535e914f1c874dfa6aef5f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13cf3a313649d7b92f28dd9fb8c27e41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34be4e71cabf458f17a6cd7f24bc70af.png)
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解答题-问答题
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适中
(0.65)
名校
【推荐2】如图所示,边长为2的正方形
和高为2的直角梯形
所在的平面互相垂直且
,
且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/13/53d3bf50-0083-440f-aa52-fd2c8206f841.png?resizew=210)
(1)求
和面
所成的角的正弦;
(2)求点C到直线
的距离;
(3)线段
上是否存在点P使过P、A、C三点的平面和直线
垂直,若存在,求
与
的比值:若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcca8b9ba7a9fdd7d18ce9c1e86d2cd5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ecc1cb55a57dde481f8dd07ab150676.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fb55961fe96e155242d18d98e5c2261.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ad3bf04b68238517703cf2f0f712aed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/597221bdc3fdacf0b653e447330df351.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/13/53d3bf50-0083-440f-aa52-fd2c8206f841.png?resizew=210)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87c0bfeadcf17b2a45896071f07a4a5a.png)
(2)求点C到直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
(3)线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f541f7ae7c39082d202efd28805c54e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb26d84907c923278ac4626a9d58947.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
【推荐1】如图,在多面体ABCDEF中,底面ABCD是边长为2的菱形,∠BAD=60°,四边形BDEF是矩形,平面BDEF⊥平面ABCD,BF=3,H是CF的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/6/89c8f13c-5d88-40f1-817b-2da9ab5323d4.png?resizew=172)
(1)求证:AC⊥平面BDEF;
(2)求直线DH与平面BDEF所成角的正弦值;
(3)求二面角H﹣BD﹣C的大小.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/6/89c8f13c-5d88-40f1-817b-2da9ab5323d4.png?resizew=172)
(1)求证:AC⊥平面BDEF;
(2)求直线DH与平面BDEF所成角的正弦值;
(3)求二面角H﹣BD﹣C的大小.
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】在三棱台
中,
,
,
为
的中点.
;
(2)求平面
和平面
所成角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31eb01ad0598f4e546f6a767f0981d2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2b263eec04e73a89ecf81a1e0bfc725.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11ddc92d84d188c66b435664a7e7b5a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a27bad0636a087e38bb1d253d66a231d.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4eb7e9ad5486cf1c5e506b20c5469e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐3】如图,在长方体
中,底面
是边长为2的正方形,
,
,
分别是
,
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/16/efd708db-d28e-4896-b142-e6c2538de740.png?resizew=155)
(1)证明:
∥平面
;
(2)求平面
与平面
夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8d927585a17c2e98ef7d5a9589a26ac.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/16/efd708db-d28e-4896-b142-e6c2538de740.png?resizew=155)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c52091eb745de866044477641a7c55f.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc78a86b12ba0b4553135a3a635fc418.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70db40c42655327adee01caedfc9d50c.png)
您最近一年使用:0次